Daniel R. Matthews,1 Huw D. Summers,1 Kerenza Njoh,1 Sally Chappell,1 Rachel Errington,1 Paul Smith,1 Iestyn Pope,2 Paul Barber,2 Boris Vojnovic,2 Simon Ameer-Beg3
1Cardiff Univ. (United Kingdom) 2Gray Cancer Institute, Mount Vernon Hospital (United Kingdom) 3King's College Hospital (United Kingdom)
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We present details of the development of a optical biochip, with integrated on-chip laser excitation, for fluorescence
intensity cell based assays. The biochip incorporates an "active surface" for the control and manipulation of fluorescent
species placed directly on the device. The active elements of the biochip are one-dimensional periodic sub-wavelength
corrugations fabricated on a thin gold film. We have made fluorescence intensity measurements of both an organic dye
(Cy5), and immobilized and fluorescently labeled (with 705 nm emitting quantum dots), mammalian tumor cells in
contact with the active surface. Here we show that the presence of the periodic grating can be used to control both the
excitation and fluorescence generation process itself. We demonstrate that the gratings convert evanescent surface optical
modes into well-defined beams of radiation in the far-field and at the surface of the device this produces highly
contrasting regions of fluorescence excitation providing regions of high spatial selectivity.
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Daniel R. Matthews, Huw D. Summers, Kerenza Njoh, Sally Chappell, Rachel Errington, Paul Smith, Iestyn Pope, Paul Barber, Boris Vojnovic, Simon Ameer-Beg, "A fluorescence biochip with a plasmon active surface," Proc. SPIE 6450, Plasmonics in Biology and Medicine IV, 645006 (14 February 2007); https://doi.org/10.1117/12.698948